"We are cooperating fully with the Chinese authorities in this matter," Glaxo's chief executive, Andrew Witty, said on Wednesday.
The GSK chief executive, Andrew Witty, said the measure, which was first announced by Labour in its 2009 pre-Budget report, had "the potential to transform" the way Britain was viewed by investors.
In comments to analysts, the drug giant's chief executive, Andrew Witty, said that it was too early to say how long the Chinese investigation into the company's sales practices would affect earnings.
The chief executive, Andrew Witty, said the company had been preparing for a pandemic for the last three-and-a-half years and had spent more than £1bn to ensure its factories could crank up production at short notice.
Sir Andrew Witty said bosses at the multinational pharmaceuticals company's London headquarters knew nothing of the millions of pounds in bribes allegedly being paid to doctors and health officials to boost sales and raise prices.
